Abstract
Range-dependent sediment acoustic properties estimated from modal dispersion data will be presented. Rajan et al. [J. Acoust. Soc. Am. 82, 998–1017 (1987)] have developed a linear perturbation technique to determine the bottom acoustic properties using group velocity dispersion relation for range-independent environments. This method has been now extended to cover range-dependent inversions for the sediment acoustic properties. Results of inversions performed using synthetic data show that the range-dependent properties can be retrieved using data from multiple source-receiver combinations. If only one source-receiver combination is used, the inversion procedure determines the range averaged sediment properties. A range-dependent inversion technique will be applied to field data from ASIAEX East China Sea (ECS) Experiment. Broad band acoustic data from Wide Band Sources (WBSs) collected on a vertical line array in frequency range 10–400 Hz will be used for the inversion. Over 200 such WBSs were deployed during the experiment and many source–receiver combinations among these will be used to investigate the range variability of compressional wave speed profiles in the ECS experiment location. Results will be compared with core data, geophysical surveys and nonlinear inversions. [Work supported by ONR.]
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